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Note 2 - Acquisitions and Divestitures - Schedule of Business Acquisition Assets and Liabilities of Valley Forge Convention Center Partners (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 17, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Goodwill | $ 971,287 | $ 1,083,287 | $ 1,062,102 |  | $ 888,224
Valley Forge Convention Center Partners, L.P. [Member] |  |  |  |  |
Property and equipment | 57,118 |  |  |  |
Intangible assets | 136,600 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  | $ 289,100 |
Revision of Prior Period, Adjustment [Member] | Valley Forge Convention Center Partners, L.P. [Member] |  |  |  |  |
Current assets | 29,280 |  |  |  |
Property and equipment | 57,118 |  |  |  |
Other assets | 2,872 |  |  |  |
Intangible assets | 136,600 |  |  |  |
Total acquired assets | 225,870 |  |  |  |
Current liabilities | 12,968 |  |  |  |
Other liabilities | 9,803 |  |  |  |
Total liabilities assumed | 22,771 |  |  |  |
Net identifiable assets acquired | 203,099 |  |  |  |
Goodwill | 85,966 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total | $ 289,065 |  |  |  |

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